<pre>
  zppdirective .directive('myRestict', function() {
     return {
       restrict: 'EACM'
     }
   })
</pre>
<pre>
    E:(元素)
    <my-restrict></my-restrict>
    A:(属性 默认值)
    <!-- <div my-restrict></div> -->
    C:(类名)
    <!-- <div class="my-restrict"></div> -->
    M:(注释)
    <!--directive:my-restrict expression-->
</pre>
